In this paper, an integrated GT-MHR/ORC cycle was analyzed. A
thermodynamic model has been developed by applying the first
and the second laws for each system component and regarding
the first- and second-law efficiency an optimization was performed
using the EES software. The model was verified through a
comparison between results of the current model and those available
in the literature for similar operating conditions. The results
obtained indicate that the first- and second-law efficiencies and
power generation of the GT-MHR/ORC plant is increased with turbine
inlet temperature. It was observed that adding ORC to GTMHR
results in a considerable decrease of exergy destruction rate
in the pre-cooler, recuperator and intercooler. It was also found
that, the exergy destruction rate for the GT-MHR/ORC cycle is
about 5% lower than that of the GT-MHR. Finally, the results revealed
that the first-law efficiency for GT-MHR/ORC cycle is
2.64–2.93%-points higher than that of the GT-MHR cycle.